System for Stacking Fuel Cells

ABSTRACT

A system for stacking fuel cells for a fuel cell stack includes, a component part storage region to store the fuel cells, a finished product storage region to store a completed fuel cell stack transferred by an automated guided vehicle, and a plurality of stacking regions disposed between the component part storage region and the finished product storage region, where a pair of stacking units are disposed at opposite sides of a first transfer robot that is centrally disposed in the stacking region, one side of the stacking region is formed as an entry and exit for the automated guided vehicle for the fuel cell stack, and the stacking region is supplied with the fuel cells from the component part storage region by the automated guided vehicle to sequentially stack the fuel cells to manufacture the fuel cell stack.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to and the benefit of Korean Patent Application No. 10-2020-0172750 filed in the Korean Intellectual Property Office on Dec. 10, 2020, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a system for stacking fuel cells.

BACKGROUND

In general, when water is electrolyzed, hydrogen and oxygen are generated, and a hydrogen fuel cell is a device that uses the reverse reaction of this electrolysis. The hydrogen fuel cell refers to producing electricity by supplying hydrogen as fuel and reacting with oxygen in air.

Unlike general chemical batteries, these hydrogen fuel cells may continuously generate electricity as long as fuel and air are supplied, and have higher energy efficiency and no noise than the turbine power generation method using fossil fuels.

In addition, the hydrogen fuel cell is an environment-friendly energy source that generates less greenhouse gas, and is a new energy that may be applied in various fields such as transportation, power generation, home, and portable use.

A typical term of hydrogen fuel cell is used to indicate a combination of a plurality of cells rather than a single cell, and is also called a fuel cell battery, a fuel cell stack, and the like.

The cell for the hydrogen fuel cell battery is manufactured by stacking negative electrodes, negative electrode gaskets, gas diffusion layers, membrane electrode assemblies, and positive electrodes.

However, in the manufacture of a cell for a hydrogen fuel cell according to the prior art, the cathode electrode, the cathode electrode gasket, the gas diffusion layer, the membrane electrode assembly, and the anode electrode are stacked one by one by the operator's manual labor, or only local automation of stacking is available. Thus, the manufacturing of hydrogen fuel cells is not fully automated.

Typically, a large number of, e.g., more than 1000, sheets of the negative electrode, negative electrode gasket, gas diffusion layer, membrane electrode assembly, and positive electrode are stacked to form a hydrogen fuel cell stack, increasing the cycle time. Thus, cycle time is large, and productivity is deteriorated.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the disclosure, and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

SUMMARY

A system for stacking fuel cells for a fuel cell stack may include, a component part storage region configured to store the fuel cells, a finished product storage region configured to store a completed fuel cell stack transferred by at least one automated guided vehicle (AGV), and a plurality of stacking regions disposed between the component part storage region and the finished product storage region, where a first transfer robot is located at a central portion of each stacking region, a pair of stacking units are disposed at opposite sides of a first transfer robot that is centrally disposed in the stacking region, one side of the stacking region is formed as an entry and exit for the at least one automated guided vehicle for the fuel cell stack, and the stacking region is supplied with the fuel cells from the component part storage region by the at least one automated guided vehicle to sequentially stack the fuel cells to manufacture the fuel cell stack.

The component part storage region may include a first tray that is multi-layered to store a plurality of types of fuel cells.

The finished product storage region may include second tray that is multi-layered to store the fuel cell stack.

The first transfer robot may be configured to assemble and package the fuel cell stack stacked in the stacking region, and transfers the fuel cell stack to the at least one automated guided vehicle.

The at least one automated guided vehicle may include a first automated guided vehicle moving between the component part storage region and the stacking region and a second automated guided vehicle moving between the stacking region and the finished product storage region.

The stacking unit may include, a pair of loading portions each configured to seat the fuel cells supplied from the at least one automated guided vehicle, a stacking portion disposed between the pair of loading portions, and configured to sequentially stack the fuel cells transferred from the loading portion, and a pair of transferring portions each disposed between the loading portion and the stacking portion, and configured to simultaneously clamp the fuel cell loaded on the loading portion and transfer the clamp the fuel cells to the stacking portion.

The loading portion may include, a plurality of loading tables that vertically operate as the fuel cell is stacked, a vacuum adsorber disposed adjacent to the loading table, and configured to remove a slip sheet of the fuel cell transferred from the loading table, through vacuum adsorption, and a vision camera disposed adjacent to the vacuum adsorber, and configured to picture the fuel cell removed with the slip sheet.

The loading table may include, a first upper plate on which the fuel cells are stacked, a plurality of first guider bars installed to penetrate the first upper plate and configured to align the fuel cells stacked on the first upper plate, a first lower plate disposed below the first upper plate and fixed to the plurality of first guider bars, a first screw shaft installed at a central portion of a lower surface of the first upper plate, engaged with a first screw housing that is rotatably mounted on the first lower plate through a first bearing housing, and formed with a first bevel gear, and a first servo-motor engaged with the first bevel gear of the first screw shaft and configured to apply torque to the first screw shaft through the first screw housing to vertically operate the first upper plate.

The loading table may further include a first height sensor configured to operate forward and backward with respect to a first auxiliary plate fixed to the first upper plate, and measure a position of the first upper plate.

The stacking portion may include, a rotation plate disposed between the pair of loading portions, and configured to rotate through a rotation portion configured at a central portion of the rotation plate where a penetration hole is formed, a plurality of stacking tables disposed on an upper surface of the rotation plate, and configured to sequentially stack the fuel cells transferred by the transferring portion to a preset quantity, and vertically operate as the fuel cells are stacked, and a tester configured to perform a leakage test for the fuel cells stacked on the stacking table when connected to the stacking table having stacked the preset quantity of fuel cells by the rotation of the rotation plate.

The rotation portion may include, a first rack gear formed at an interior circumference of the penetration hole, a first drive gear engaged with the first rack gear, and a third servo-motor connected to the first drive gear and configured to transmit driving torque to the first drive gear.

The stacking table may include, a second upper plate on which the fuel cells are stacked, a plurality of second guider bars installed to penetrate the second upper plate and configured to align the fuel cells stacked on the second upper plate, a second lower plate disposed below the second upper plate and fixed to the plurality of second guider bars, a second screw shaft installed at a central portion of a lower surface of the second upper plate, engaged with a second screw housing that is rotatably mounted on the second lower plate through second bearing housing, and formed with a second bevel gear, and a second servo-motor engaged with the second bevel gear of the second screw shaft and configured to apply torque to the second screw shaft through the second screw housing to vertically operate the second upper plate.

The stacking table may further include a second height sensor configured to operate forward and backward with respect to a second auxiliary plate fixed to the second upper plate, and measure a position of the second upper plate.

The tester may be configured to, when the stacking table is positioned to a home position by the rotation of the rotation plate, move downward to the stacking table to be connected the stacking table and inject gas into the fuel cells 10 stacked on the stacking table.

The transferring portion may include, a fourth servo-motor installed in an actuation body, and connected to a second drive gear through a vertically disposed drive shaft, a circular plate coupled to the second drive gear, at least one supporting member extending from the circular plate in the form of a cantilever and integrally formed to the circular plate, and an adsorber disposed downward at an end portion of the supporting member, and configured to vertically operate, adsorb the fuel cells loaded in the loading portion, and transfer the adsorbed fuel cells to the stacking portion.

The adsorber may include, an adsorption plate configured to clamp and unclamp the fuel cell through vacuum adsorption and release, a third screw shaft that is connected to the adsorption plate and inserted into an engagement hole of the supporting member, and configured to vertically operate through the engagement hole, and a fifth servo-motor engaged with a driven gear configured at the third screw shaft and configured to apply a torque to the third screw shaft to vertically operate the adsorption plate.

The transferring portion may further include, a collision preventing member formed to the circular plate in a direction apart from the at least one supporting member, and a pressure sensor mounted at an end portion of the collision preventing member interposing a spring.

According to a system for stacking the fuel cells according to an exemplary embodiment, a production line may be formed from supplying of the fuel cell to storing the completed fuel cell stack, and thereby it is possible to reduce labor costs and improve production quality.

According to a system for stacking the fuel cells 10 according to an exemplary embodiment, by optimally designing arrangement of working regions, movements of the first transfer robot 30 may be minimized. In addition, by disposing a loading portion at both sides of the stacking portion and employing a rotatable transferring portion, overall cycle time may be reduced, and productivity may be improved.

Other effects that may be obtained or are predicted by an exemplary embodiment will be explicitly or implicitly described in a detailed description of the present disclosure. That is, various effects that are predicted according to an exemplary embodiment will be described in the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a general schematic diagram of a hydrogen fuel cell stack manufactured by a system for stacking fuel cells according to an exemplary embodiment.

FIG. 2 is an overall schematic diagram of a system for stacking fuel cells according to an exemplary embodiment.

FIG. 3 is a schematic diagram of a stacking region applied to a system for stacking fuel cells according to an exemplary embodiment.

FIG. 4 is a schematic diagram of a stacking unit applied to a system for stacking fuel cells according to an exemplary embodiment.

FIG. 5 is a schematic diagram of a loading portion applied to a system for stacking fuel cells according to an exemplary embodiment

FIG. 6 is another schematic diagram of a loading portion applied to a system for stacking fuel cells according to an exemplary embodiment.

FIG. 7 is a schematic diagram of a stacking portion applied to a system for stacking fuel cells according to an exemplary embodiment.

FIG. 8 is a schematic diagram of a transferring portion applied to a system for stacking fuel cells according to an exemplary embodiment.

DETAILED DESCRIPTION

The present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present disclosure.

In order to clarify the present disclosure, parts that are not related to the description will be omitted, and the same elements or equivalents are referred to with the same reference numerals throughout the specification.

In the following description, dividing names of components into first, second, and the like is to divide the names because the names of the components are the same as each other, and an order thereof is not particularly limited.

A system for stacking fuel cells according to an exemplary embodiment may be used to manufacture a fuel cell stack.

Particularly, a system for stacking fuel cells according to an exemplary embodiment may be applied to manufacture a hydrogen fuel cell stack.

FIG. 1 is a general schematic diagram of a hydrogen fuel cell stack manufactured by a system for stacking fuel cells according to an exemplary embodiment.

Referring to FIG. 1, the hydrogen fuel cell stack 1 may be manufactured by stacking generally 1000 pieces of fuel cells 10 formed of a gas diffusion layer 11, a positive electrode 12, a polymer electrolyte membrane 13, a negative electrode 14, and an oxygen diffusion layer 15.

That is, each fuel cell 10 includes the gas diffusion layer 11, the positive electrode 12, the polymer electrolyte membrane 13, the negative electrode 14, and the oxygen diffusion layer 15, and the fuel cell stack 1 is supposed to be formed by stacking generally 1000 pieces of the fuel cells 10.

FIG. 2 is an overall schematic diagram of a system for stacking fuel cells according to an exemplary embodiment.

Referring to FIG. 2, a system for stacking fuel cells according to an exemplary embodiment includes a component part storage region 40, a finished product storage region 50, and a stacking region 60.

The component part storage region 40 is a region that stores the fuel cells 10.

The component part storage region 40 may include a first tray 41 that is multi-layered to store various types of the fuel cells 10.

The first tray 41 includes a plurality of compartments disposed horizontally and vertically, and each fuel cell 10 may be stored in each compartment

In addition, the finished product storage region 50 is a region that stores the fuel cell stack 1 completed in the stacking region 60 and transferred by the automated guided vehicle 20.

The finished product storage region 50 may include a second tray 51 that is multi-layered to store a plurality of types of the fuel cell stack 1.

The second tray 51 includes a plurality of compartments disposed horizontally and vertically, and each fuel cell stack 1 may be stored in each compartment

At this time, a first transfer robot 30 assembles and packages the fuel cell stack 1 stacked in the stacking region 60, and transfers the fuel cell stack 1 to the automated guided vehicle 20.

The first transfer robot 30 may clamp the fuel cell stack 1 through a robot arm while moving between the stacking units 61.

In a variation, the first transfer robot 30 may be fixed to the preset position, e.g., a central portion, of the stacking units 61 and configured to clamp the fuel cell stack 1 through the robot arm.

In addition, the automated guided vehicle 20 may include a first automated guided vehicle 20 a moving between the component part storage region 40 and the stacking region 60 and a second automated guided vehicle 20 b moving between the stacking region 60 and the finished product storage region 50.

The first automated guided vehicle 20 a and the second automated guided vehicle 20 b moves along preset paths, respectively.

In the present disclosure, the automated guided vehicle 20 is described to include the first automated guided vehicle 20 a and the second automated guided vehicle 20 b, however, the present embodiment is not limited thereto. It may be understood that one automated guided vehicle 20 may be configured to move between the component part storage region 40, the stacking region 60, and the finished product storage region 50.

Hereinafter, the embodiment is described in connection with an example where one automated guided vehicle 20 moves the component part storage region 40, the stacking region 60, and the finished product storage region 50.

FIG. 3 is a schematic diagram of a stacking region applied to a system for stacking fuel cells according to an exemplary embodiment. FIG. 4 is a schematic diagram of a stacking unit applied to a system for stacking fuel cells according to an exemplary embodiment.

A plurality of stacking regions 60 are disposed between the component part storage region 40 and the finished product storage region 50.

The stacking region 60 is disposed to be supplied with the fuel cells 10 from the component part storage region 40 by the automated guided vehicle 20.

That is, the stacking region 60 may be disposed such that movement of the automated guided vehicle 20 may be minimized.

The plurality of stacking region 60 may be disposed at adjacent positions with a same configuration.

Referring to FIG. 3, the stacking region 60 includes a plurality of stacking units 61 that is supplied with the fuel cells 10 from the component part storage region 40 by the automated guided vehicle 20 and configured to sequentially stack the fuel cells 10 to manufacture the fuel cell stack 1.

The stacking unit 61 is disposed at opposite sides of the first transfer robot 30 that is centrally disposed in the stacking region 60.

One side of the stacking region 60 is formed as an entry and exit for the automated guided vehicle 20 for the fuel cell stack.

In the stacking region 60, the fuel cells 10 is sequentially stacked to manufacture the fuel cell stack 1, and then the fuel cell stack 1 is discharged through the entry and exit by the automated guided vehicle 20.

The stacking unit 61 may be configured to be supplied with and sequentially stack the fuel cells 10 to form the fuel cell stack 1, and package to finish the fuel cell stack 1 by the first transfer robot 30, e.g., by assembling with fasteners such as bolts. For such a purpose, referring to FIG. 4, each stacking unit 61 includes, a pair of loading portions 63, a stacking portion 70, and a transferring portion 80 disposed adjacent to the stacking unit 61.

Each of the pair of loading portions 63 is configured to seat the fuel cells 10 supplied from the at least one automated guided vehicle 20.

At this time, each loading portion 63 may be supplied with fuel cells 10 transferred by the automated guided vehicle 20, through a second transfer robot 31.

The pair of loading portions 63 are formed in the same configuration, and one loading portion 63 will be described as an example.

FIG. 5 and FIG. 6 are respectively a schematic diagram of a loading portion applied to a system for stacking fuel cells according to an exemplary embodiment.

Referring to FIG. 4, the loading portion 63 includes a plurality of loading tables 630 that vertically operate as the fuel cell 10 is stacked.

The quantity of the loading table 630 may be set depending on the types of the fuel cell 10.

For example, FIG. 4 illustrates that three loading tables 630 are disposed in the loading portion 63 shown in the left, and two loading tables 630 are disposed in the loading portion 63 shown in the right

However, it may be understood that the present embodiment is not limited to the illustrated number of loading tables 630.

The loading table 630 includes a first upper plate 631, a first guider bar 632, a first lower plate 633, a first screw shaft 634, and a first servo-motor M1.

The loading table 630 is configured to stack the fuel cells 10 on the first upper plate 631.

A plurality of first guider bars 632 are installed to penetrate the first upper plate 631.

For example, the first upper plate 631 may be formed in a shape corresponding to the fuel cells 10, e.g., in a rectangular shape.

The first guider bars 632 may be mounted on each corner of the first upper plate 631 such that the fuel cells 10 stacked on the upper surface of the first upper plate 631 may be aligned by the first guider bars 632.

In addition, the first lower plate 633 is disposed below the first upper plate 631.

The first lower plate 633 is apart from the first upper plate 631 and fixed to the first guider bar 632.

The first screw shaft 634 is installed at a central portion of a lower surface of the first upper plate 631.

Below the first upper plate 631, the first screw shaft 634 is engaged with a first screw housing 636 that is rotatably mounted on the first lower plate 633 through the first bearing housing 635.

At this time, a first bevel gear 637 is disposed at the first screw shaft 634, and connected to the first servo-motor M1.

That is, the first servo-motor M1 is engaged with the first bevel gear 637 and configured to apply torque to the first screw shaft 634 through the first screw housing 636 to vertically operate the first upper plate 631.

The height of the first upper plate 631 is adjusted as the fuel cells 10 are stacked, and the loading table 630 is provided with a first height sensor 64 used to adjust the height.

A first auxiliary plate 638 is fixed to a side surface of the first upper plate 631, and the first height sensor 64 is configured to operate forward and backward with respect to the first auxiliary plate 638 and measure the height of the first upper plate 631 by measuring a relative distance to the first auxiliary plate 638.

For example, the first height sensor 64 may include a first linear scale 641 operated by a first air cylinder 640.

In addition, a vacuum adsorber 65 is disposed adjacent to the loading table 630.

Referring to FIG. 6, the vacuum adsorber 65 may remove a slip sheet 16 of the fuel cell 10 transferred from the adjacent loading table 630 through vacuum adsorption.

A vision camera 67 is disposed adjacent, specifically attached in this embodiment, to the vacuum adsorber 65.

The vision camera 67 is configured to picture the fuel cell 10 from which the slip sheet 16 has been removed such that visual inspection of the removal of the slip sheet 16 may be available.

The vacuum adsorber 65 and the vision camera 67 may be configured to operate when the slip sheet 16 is attached to the fuel cell 10.

In addition, the stacking portion 70 is formed between the pair of loading portions 63.

FIG. 7 is a schematic diagram of a stacking portion applied to a system for stacking fuel cells according to an exemplary embodiment.

Referring to FIG. 7, the fuel cells 10 transferred from the loading portion 63 is sequentially stacked in the stacking portion 70.

That is, the fuel cells 10 are supplied from the component part storage region 40 to the loading table 630, and the fuel cells 10 seated on the loading table 630 are transferred to and sequentially stacked in the stacking portion 70.

The stacking portion 70 includes a rotation plate 71, a stacking table 730, and a tester 75.

The rotation plate 71 is disposed between the pair of loading portions 63.

The rotation plate 71 rotates through a rotation portion 72 configured at a central portion of the rotation plate 71 where a penetration hole 720 is formed.

The rotation portion 72 includes a first rack gear 721 formed on an interior circumference of the penetration hole 720.

In addition, the first rack gear 721 is engaged with a first drive gear 722.

The first drive gear 722 is connected to a third servo-motor M3, which transmits a driving torque to the first drive gear 722.

In addition, a reducer 723 is interposed between the third servo-motor M3 and the first drive gear 722 to reduce the rotation speed of the third servo-motor M3 such that the rotation speed of the rotation plate 71 may be finely controlled by the third servo-motor M3.

A plurality of stacking table 730 are disposed on the upper surface of the rotation plate 71.

The stacking tables 730 may be disposed with a preset spacing along a circumference of the rotation plate 71.

For example, FIG. 7 illustrates that three stacking tables 730 are disposed on the rotation plate 71 with a spacing of 120 degrees.

However, it may be understood that the present embodiment is not limited to the illustrated configuration.

The fuel cells 10 transferred by the transferring portion 80 are sequentially stacked on the stacking table 730 to a preset quantity.

The stacking table 730 vertically operates as the fuel cells 10 are stacked.

The stacking table 730 may be formed in the same configuration as the loading table 630, and is not described in further detail.

As shown in FIG. 7, the stacking table 730 includes a second upper plate 731, a second guider bar 732, a second lower plate 733, a second screw shaft 734, a second bearing housing 735, a second screw housing 736, a second bevel gear 737, a second auxiliary plate 738, a second servo-motor M2, a second height sensor 74, a second air cylinder 740, and a second linear scale 741.

For details of the second upper plate 731, the second guider bar 732, the second lower plate 733, the second screw shaft 734, the second bearing housing 735, the second screw housing 736, the second bevel gear 737, the second auxiliary plate 738, the second servo-motor M2, the second height sensor 74, the second air cylinder 740, and the second linear scale 741, the above description in connection with the first upper plate 631, the first guider bar 632, the first lower plate 633, the first screw shaft 634, the first bearing housing 635, the first screw housing 636, the first bevel gear 637, the first auxiliary plate 638, the first servo-motor M1, the first height sensor 64, the first air cylinder 640, and the first linear scale 641 may be referred to.

The stacking table 730 is configured to stack the fuel cells 10 transferred from the pair of loading portions 63 while continuously changing position by a preset angle.

In addition, when the fuel cells 10 are stacked on the stacking table 730 to the preset quantity, the stacking table 730 is connected to the tester 75 by the rotation of the rotation plate 71.

The tester 75 is to perform a leakage test of the stacked fuel cells 10, and may be fixed by a separate frame (not shown).

When the stacking table 730 having stacked the preset quantity of fuel cells 10 is positioned at a home position by the rotation of the rotation plate 71, the tester 75 moves downward to the stacking table 730 and is connected to the stacking table 730.

At this time, the tester 75 may be inserted between the second guider bars 732.

The tester 75 is configured to inject gas into the fuel cells 10 stacked on the stacking table 730, for the leakage test.

The transferring portion 80 is formed between a corresponding loading portion 63 and the stacking portion 70 described above.

FIG. 8 is a schematic diagram of a transferring portion applied to a system for stacking fuel cells according to an exemplary embodiment.

As shown in FIG. 4, the transferring portion 80 is configured to simultaneously clamps the fuel cells 10 loaded in the loading portion 63 and transfer the clamped fuel cells 10 to the stacking portion 70.

FIG. 4 illustrates a pair of transferring portion 80 each disposed between a corresponding loading portion 63 and the stacking portion 70, however, the present embodiment is not limited to the illustrated number of transferring portions 80 and their configuration.

Each transferring portion 80 includes an actuation body 81 corresponding to the loading portions 63.

A fourth servo-motor M4 is installed in the actuation body 81.

The fourth servo-motor M4 is connected to a second drive gear 83 through a drive shaft that is vertically disposed.

A circular plate 85 is coupled to the second drive gear 83.

A supporting member 87 extends from the circular plate 85 in the form of a cantilever, and is integrally formed to the circular plate 85.

It may be understood that FIG. 8 only illustrates a single supporting member 87, however the present embodiment is not limited thereto. More than one supporting members 87 may be provided to simultaneously clamp the fuel cells 10.

For example, the quantity of the supporting member 87 may be dependent on the number of types of the fuel cells 10, such that different types of fuel cells 10 may be processed at the same time.

For example, two supporting members 87 may be provided for one transferring portion 80, and three supporting members 87 may be provided for another transferring portion 80.

Such plurality of supporting members 87 may be configured to be spaced apart from each other.

An adsorber 89 is configured downward at an end portion of the supporting member 87.

The adsorber 89 is configured to vertically operate, adsorb the fuel cells 10 loaded in the loading portion 63, and transfer the adsorbed fuel cells 10 to the stacking portion 70.

At this time, the adsorber 89 includes an adsorption plate 890 that may directly contact the fuel cell 10.

The adsorption plate 890 is configured to clamp and unclamp the fuel cell 10 through vacuum adsorption and release.

An upper surface of the adsorption plate 890 is connected to a third screw shaft 891.

In more detail, the third screw shaft 891 is partially inserted into an engagement hole 893 of the supporting member 87.

The third screw shaft 891 is configured to vertically operate while being coupled into the engagement hole 893.

This third screw shaft 891 may be operated by a fifth servo-motor M5.

A drive gear 895 is formed at an end of a drive shaft of the fifth servo-motor M5, and the drive gear 895 is engaged with a driven gear 897 configured at a frontal end portion of the third screw shaft 891.

In addition, the fifth servo-motor M5 is configured to apply a torque to the third screw shaft 891 to vertically operate the adsorption plate 890.

In addition, a collision preventing member 90 may be formed to the circular plate 85 of the transferring portion 80.

The collision preventing member 90 may be formed to the circular plate 85 in a direction apart from the supporting member 87.

A pressure sensor 93 mounted at an end portion of the collision preventing member 90 interposing a spring 91.

The pressure sensor 93 is employed to detect and/or prevent a collision with another transferring portion 80, for example, in the case of malfunctioning of the transferring portion 80.

Therefore, according to a system for stacking the fuel cells according to an exemplary embodiment, a production line may be formed from supplying of the fuel cell to storing the completed fuel cell stack, and thereby it is possible to reduce labor costs and improve production quality.

According to a system for stacking the fuel cells 10 according to an exemplary embodiment, by optimally designing arrangement of working regions, movements of the first transfer robot 30 may be minimized. In addition, by disposing a loading portion at both sides of the stacking portion and employing a rotatable transferring portion, overall cycle time may be reduced, and productivity may be improved.

In addition, according to a system for stacking the fuel cells 10 according to an exemplary embodiment, a stack height of the fuel cell may be measured and controlled in real time, so the stack status of the fuel cell may be checked in rear time.

In addition, according to a system for stacking the fuel cells 10 according to an exemplary embodiment, lean production is possible, and there is an advantage in inventory management.

While this disclosure has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the disclosure is not limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. 

What is claimed is:
 1. A system for stacking fuel cells for a fuel cell stack, comprising: a component part storage region configured to store the fuel cells; a finished product storage region configured to store a completed fuel cell stack transferred by at least one automated guided vehicle (AGV); and a plurality of stacking regions disposed between the component part storage region and the finished product storage region, wherein a first transfer robot is located at a central portion of each stacking region, wherein a pair of stacking units are disposed at opposite sides of a first transfer robot that is centrally disposed in the stacking region, wherein one side of the stacking region is formed as an entry and exit for the at least one automated guided vehicle for the fuel cell stack, and wherein the stacking region is supplied with the fuel cells from the component part storage region by the at least one automated guided vehicle to sequentially stack the fuel cells to manufacture the fuel cell stack.
 2. The system of claim 1, wherein the component part storage region comprises a first tray that is multi-layered to store a plurality of types of fuel cells.
 3. The system of claim 1, wherein the finished product storage region comprises a second tray that is multi-layered to store the fuel cell stack.
 4. The system of claim 1, wherein the first transfer robot is configured to assemble and package the fuel cell stack stacked in the stacking region, and transfers the fuel cell stack to the at least one automated guided vehicle.
 5. The system of claim 1, wherein the at least one automated guided vehicle comprises a first automated guided vehicle moving between the component part storage region and the stacking region and a second automated guided vehicle moving between the stacking region and the finished product storage region.
 6. The system of claim 1, wherein the stacking unit comprises: a pair of loading portions each configured to seat the fuel cells supplied from the at least one automated guided vehicle; a stacking portion disposed between the pair of loading portions, and configured to sequentially stack the fuel cells transferred from the loading portion; and a pair of transferring portions each disposed between the loading portion and the stacking portion, and configured to simultaneously clamp the fuel cell loaded on the loading portion and transfer the clamp the fuel cells to the stacking portion.
 7. The system of claim 6, wherein the loading portion comprises: a plurality of loading tables that vertically operate as the fuel cell is stacked; a vacuum adsorber disposed adjacent to the loading table, and configured to remove a slip sheet of the fuel cell transferred from the loading table, through vacuum adsorption; and a vision camera disposed adjacent to the vacuum adsorber, and configured to picture the fuel cell removed with the slip sheet.
 8. The system of claim 7, wherein the loading table comprises: a first upper plate on which the fuel cells are stacked; a plurality of first guider bars installed to penetrate the first upper plate and configured to align the fuel cells stacked on the first upper plate; a first lower plate disposed below the first upper plate and fixed to the plurality of first guider bars; a first screw shaft installed at a central portion of a lower surface of the first upper plate, engaged with a first screw housing that is rotatably mounted on the first lower plate through a first bearing housing, and formed with a first bevel gear; and a first servo-motor engaged with the first bevel gear of the first screw shaft and configured to apply torque to the first screw shaft through the first screw housing to vertically operate the first upper plate.
 9. The system of claim 8, wherein the loading table further comprises a first height sensor configured to operate forward and backward with respect to a first auxiliary plate fixed to the first upper plate, and measure a position of the first upper plate.
 10. The system of claim 6, wherein the stacking portion comprises: a rotation plate disposed between the pair of loading portions, and configured to rotate through a rotation portion configured at a central portion of the rotation plate where a penetration hole is formed; a plurality of stacking tables disposed on an upper surface of the rotation plate, and configured to sequentially stack the fuel cells transferred by the transferring portion to a preset quantity of fuel cells, and vertically operate as the fuel cells are stacked; and a tester configured to perform a leakage test for the fuel cells stacked on the stacking table when connected to the stacking table having stacked the preset quantity of fuel cells by the rotation of the rotation plate.
 11. The system of claim 10, wherein the rotation portion comprises: a first rack gear formed at an interior circumference of the penetration hole; a first drive gear engaged with the first rack gear; and a third servo-motor connected to the first drive gear and configured to transmit driving torque to the first drive gear.
 12. The system of claim 10, wherein the stacking table comprises: a second upper plate on which the fuel cells are stacked; a plurality of second guider bars installed to penetrate the second upper plate and configured to align the fuel cells stacked on the second upper plate; a second lower plate disposed below the second upper plate and fixed to the plurality of second guider bars; a second screw shaft installed at a central portion of a lower surface of the second upper plate, engaged with a second screw housing that is rotatably mounted on the second lower plate through second bearing housing, and formed with a second bevel gear; and a second servo-motor engaged with the second bevel gear of the second screw shaft and configured to apply torque to the second screw shaft through the second screw housing to vertically operate the second upper plate.
 13. The system of claim 12, wherein the stacking table further comprises a second height sensor configured to operate forward and backward with respect to a second auxiliary plate fixed to the second upper plate, and measure a position of the second upper plate.
 14. The system of claim 10, wherein the tester is configured to, when the stacking table is positioned to a home position by the rotation of the rotation plate, move downward to the stacking table to be connected the stacking table and inject gas into the fuel cells 10 stacked on the stacking table.
 15. The system of claim 6, wherein the transferring portion comprises: a fourth servo-motor installed in an actuation body, and connected to a second drive gear through a vertically disposed drive shaft; a circular plate coupled to the second drive gear; at least one supporting member extending from the circular plate in the form of a cantilever and integrally formed to the circular plate; and an adsorber disposed downward at an end portion of the supporting member, and configured to vertically operate, adsorb the fuel cells loaded in the loading portion, and transfer the adsorbed fuel cells to the stacking portion.
 16. The system of claim 15, wherein the adsorber comprises: an adsorption plate configured to clamp and unclamp the fuel cell through vacuum adsorption and release; a third screw shaft that is connected to the adsorption plate and inserted into an engagement hole of the supporting member, and configured to vertically operate through the engagement hole; and a fifth servo-motor engaged with a driven gear configured at the third screw shaft and configured to apply a torque to the third screw shaft to vertically operate the adsorption plate.
 17. The system of claim 15, wherein the transferring portion further comprises: a collision preventing member formed to the circular plate in a direction apart from the at least one supporting member; and a pressure sensor mounted at an end portion of the collision preventing member interposing a spring. 